Mechanical keyboards are frequently sold with a blank spacebar. You may want to spice things up by customizing your spacebar. Sometimes you want to keep things clean and simple by using a different colored keycap on your space bar. However, choosing a spacebar can be pretty tricky because there are so many different sizes and types available. Luckily, Hiros Art has put together this ultimate keycap size guide to help you select the right ones for your mechanical keyboards.

Keycap sizes 

Keycaps are the plastic caps that cover each individual key and contribute significantly to the aesthetics of a keyboard. Every keycap on a keyboard is built around a 1u base size. When purchasing a keycap set for your board’s specific layout, you’ll need to know the size of the required caps and which row they sit on.

Standard XDA Japanese Keyset
Standard XDA Japanese Keyset

For those of you who are unfamiliar with the term, the unit of measurement used in keycaps is u. The smallest 1×1 unit used for letters, numbers, the function row, arrow keys, and so on is denoted by 1u. Larger keys are referred to in proportion to those referred to as 1u keys. For example, a standard Tab key is 1.5u which means that it’s 1.5x the size of a 1u key. (Stabilizers are also required for keycaps that are 2u or longer).

It’s critical to understand what sizes are required for which keyboard layouts, especially if you use unstandardized layouts. Most sets will work if you use a full-sized keyboard or a tenkeyless keyboard, as they are compatible with most 104-key sets. It’s when you get smaller that things get tricky. If you are looking for a spacebar for your mechanical keyboard but are confused about what size to choose, Hiros Art is here to help.

Spacebar dimensions for alps switch keyboards

Alps SKCL/SKCM series switches also referred to as complicated Alps, Alps Bigfoot, and Alps CM, are the most common Alps switches used in computer keyboards.

6.25u spacebar

  • Dell AT101W keyboard
  • Dell AT102W keyboard

6.5u spacebar

  • Apple Extended Keyboard
  • Apple Extended Keyboard II

7u spacebar (133mm wide, 3 mounts, 19.05mm apart)

  • Ortek 142 Pro

7u spacebar

  • Dell AT101
  • Dell AT102
  • SGI 041-0136-001 Bigfoot
  • SGI 9500801 Bigfoot
  • SGI 9500829 Bigfoot
  • SGI 9500900 Bigfoot “Granite”

Spacebar dimensions for Cherry MX switch keyboards

Cherry MX is the most common switch. According to Cherry, 1 unit is 19.05mm, or 0.75″.

1.5 units (28mm wide, 1 center mount)

  • Phantom keyboards with 7bit’s switch layout

3 units (57mm wide, 3 mounts, 19.05mm apart)

One center mount and two additional mounts, one unit (19.05mm) to the left and right of the center. Molds in the Signature Plastics SA family in the shape of a regular key are available for this spacebar.

4 units (76mm wide, 3 mounts, 28.5mm apart)

One center mount and two additional 1.5 unit (28.575mm) mounts to the left and right of the center. Signature Plastics SA molds are available for this space bar.

  • Tipro keyboard

4.5 units (85mm wide, 3 mounts, 34.671mm apart)

There is a single-center mount and two stabilizer mounts 1.82 units (34.671mm) to the left and right of it. This space bar is available in Signature Plastics SA molds.

5.5 units (104.5mm wide, 3 mounts, 43mm apart)

One center mount and 2 mounts 2.25 units (42.8625mm) left and right of the center.

  • Noppoo keyboard 

6 units (114mm wide, 3 key mounts, 57mm and 38mm apart)

Three key mounts, one 0.5 unit (9.525mm) right from the center, three units (57.15mm) to the left, and two units (38.1mm) to the right of the middle mount. The center-to-center distance of the stabilizer is 95mm.

Mounts from left to right at

  • 0.5 units
  • 3.5 units
  • 5.5 units
  • Cherry G80-1800 with windows keys
  • Cherry G80-11900 with windows keys
  • Cherry G80-11908
  • Cherry G80-11800 with windows keys

6 units (114mm wide, 3 key mounts, 38mm apart)

114mm wide, with one center mount and two 2 unit (38.1mm) mounts to the left and right of the center.

  • Razer BlackWidow keyboard
  • TG3 BL-82 keyboard

6 units (114mm wide, 3 key mounts, 43.5mm apart)

114mm wide with one center mount and two mounts (43.5mm and 49mm center-to-center) to the left and right of the center. The center-to-center distance of the stabilizer is 98mm.

  • CMStorm QuickFire Ultimate

6.25 units (118mm wide, 3 mounts, 50mm apart)

One center mount and 2 extra mounts 50mm left and right of the center. These space bar measures are covered by the Signature Plastics Universal Space Bar.

  • Filco
  • Ducky
  • KBC Poker
  • Das Keyboard 3
  • PLUM
  • CM Storm Quickfire Rapid
  • Keycool 87 (newer model 2012)
  • Keycool 71
  • Drevo Calibur

6.25 units (118mm wide, 3 mounts, no center mount)

3 mounts: two mounts 50mm apart from the center, one mount 11.9mm to the right. Mounts from left to right at:

  • 0.5 units
  • 3.75 units
  • 5.75 units

Signature Plastics Universal Space Bars from the DCS and SA families cover these space bar measurements.

  • Cherry G80-1000 (with windows keys; 3 modifiers left, 4 modifiers right)
  • Cherry G80-3000 (with windows keys; 3 modifiers left, 4 modifiers right)
  • Das Keyboard 2

6.25 units (118mm wide, 3 mounts, 40mm apart)

One center mount and two 2.1 unit (40mm) mounts left and right of the center. Signature Plastics Universal Space Bars from both the DCS and SA families cover these space bar measurements.

  • Leopold FC200
  • SteelSeries 6GV2
  • SteelSeries 7G
  • Zowie Celeritas

6.25 units (118mm wide, 3 mounts, 42.5 mm apart)

One center mount and two mounts 42.5 mm) left and right of the center

  • Leopold FC500
  • Keycool 87 (older model before 2012)

6.25 units (118mm wide, 6 mounts)

Deck Hassium Pro DS PBT Spacebar is ABS, and the rest of the keys are DS PBT.

6.5 units (123mm wide, 3 mounts, 52.25mm apart)

One center mount and two 2.75 unit (52.38mm) mounts to the left and right of the center.

  • CM Storm QuickFire TK
  • CM Storm QuickFire TK Stealth
  • Corsair Vengeance K60
  • Corsair Vengeance K65
  • Corsair Vengeance K70
  • Corsair Vengeance K90
  • Corsair Vengeance K95
  • Logitech G710+

7 units (133mm wide, 3 mounts, 57mm apart)

One center mount and two 3 unit (57.15mm) mounts to the left and right of the center.

  • Cherry G80-1000 (101/102 key keyboards without windows keys)
  • Cherry G80-1800 (101/102 key keyboards without windows keys)
  • Cherry G80-3000 (101/102 key keyboards without windows keys)
  • Cherry G80-2100
  • Cherry G80-2510
  • Cherry G80-2550

7 units (133mm wide, 3 mounts, 57mm and 42.8mm apart)

One center mount and two additional mounts, one 3 units (57.15mm) to the left of the center and one 2.25 units (42.8625mm) to the right.

  • MX-11800 (Compaq)

7 units (133mm wide, 3 mounts, 55mm apart)

  • Propac keyboards

8 units (152mm wide, 3 mounts, 66.7mm apart)

One center mount and two 3.5 unit (66.675mm) mounts to the left and right of the center. Signature Plastics has tools in the DCS family for this space bar.

  • Wyse PCE Keyboard

9 units (171mm wide, 3 mounts, 66.675mm apart)

One center mount and two mounts 3.5 units left and right of the center.

  • Cherry G80-0904 (Commodore Amiga 2000)

9.75 units (185.25mm wide, 3 mounts, 66.5mm apart)

One center mount and two mounts 3.5 units (66.675mm) left and right of the center. For this spacebar Signature Plastics has tools in the DCS family.

  • WYSE ASCII Keyboard 

10 units (190mm wide, 3 mounts, 66.5mm apart)

One center mount and two mounts 3.5 units (66.675mm) left and right of the center.

  • Cherry G80-0528
  • Cherry G80-0542
  • Cherry G80-0777
  • Cherry G80-0778
  • Cherry G80-0779
  • Cherry G80-0915 (Commodore PC-5)

Where to find unique spacebar keycaps online?

Whether you are a programmer, an artist, or a gamer, if you are looking for the best artisan spacebar or other keyboard accessories to complete your gaming setup, then Hiros Art is the perfect place for you. We bring you the most durable and unique keycaps with a variety of sizes, colors, and styles currently on the market. A custom keycap is a must-have for any mechanical keyboard lovers, and now you can purchase one in our store at a reasonable price.

Gengar and Haunter Spacebar Keycap
Gengar and haunter spacebar

Get yours today by visiting our store.

We hope that with the information we provided, you’ll now have an easier time making the right decision when picking out keycaps for your board.